Table 1.
Effects of biochar or absorber amendments on leaf gas exchange of Chenopodium quinoa Willd. (ICBA-5 variety) with light saturation (1200 PPFD) after culture in nutrient solution or with 27 days of salt treatment. Net CO2 assimilation (Anet), transpiration rate (Tr), substomatal CO2 concentration (Ci), stomatal conductance (gs) and water-use efficiency (PWUE = Anet/Tr) values represent mean ± SE (n = 5), and the different letters a to d indicate significant differences between the treatments (Tukey test, p < 0.05). Control (0), (300 mM NaCl), biochar (Bc), absorber (Ab).
| NaCl (mM) | Asat (µmol m−2 s−1) | Tr (mmol m−2 s−1) | Ci | gs (mmol H2O m−2 s−1) | PWUE (µmol CO2 mmol H2O−1) |
|---|---|---|---|---|---|
| 0 | 21.50 ± 1.79 c | 2.9 ± 0.33 c | 291.67 ± 17.31 d | 0.22 ± 0.06 c | 7.50 ± 1.38 b |
| 0 + Bc | 22.84 ± 1.96 c | 2.88 ± 0.45 c | 186.19 ± 12.00 c | 0.18 ± 0.03 c | 8.13 ± 1.98 b |
| 0 + Ab | 26.95 ± 2.42 d | 6.79 ± 0.42 d | 304.44 ± 14.87 d | 0.66 ± 0.09 d | 3.97 ± 0.41 a |
| 300 | 6.36 ± 0.30 a | 1.03 ± 0.01 a | 113.89 ± 25.45 a | 0.06 ± 0.01 a | 6.16 ± 0.35 b |
| 300 + Bc | 12.51 ± 0.58 b | 1.74 ± 0.30 b | 224.14 ± 24.50 b | 0.14 ± 0.02 b | 7.37 ± 1.66 b |
| 300 + Ab | 13.66 ± 1.30 b | 1.58 ± 0.34 b | 128.91 ± 21.84 a | 0.12 ± 0.03 b | 8.93 ± 2.25 b |